/* * Copyright (c) 2016-2017 Piotr Mienkowski * SPDX-License-Identifier: Apache-2.0 */ /** @file * @brief Atmel SAM MCU family General Purpose Input Output (GPIO) * module HAL driver. */ #ifndef _ATMEL_SAM_SOC_GPIO_H_ #define _ATMEL_SAM_SOC_GPIO_H_ #include #include /* * Pin flags/attributes */ /* TODO: replace hard coded pin attribute values with defines provided * in gpio.h, once the official API is clean. */ #define SOC_GPIO_DEFAULT (0) #define SOC_GPIO_PULLUP (1 << 0) #define SOC_GPIO_PULLDOWN (1 << 1) #define SOC_GPIO_OPENDRAIN (1 << 2) /* Bit field: SOC_GPIO_IN_FILTER */ #define SOC_GPIO_IN_FILTER_POS 3 #define SOC_GPIO_IN_FILTER_MASK (3 << SOC_GPIO_IN_FILTER_POS) #define SOC_GPIO_IN_FILTER_NONE (0 << SOC_GPIO_IN_FILTER_POS) #define SOC_GPIO_IN_FILTER_DEBOUNCE (1 << SOC_GPIO_IN_FILTER_POS) #define SOC_GPIO_IN_FILTER_DEGLITCH (2 << SOC_GPIO_IN_FILTER_POS) #define SOC_GPIO_INT_ENABLE (1 << 5) /* Bit field: SOC_GPIO_INT_TRIG */ #define SOC_GPIO_INT_TRIG_POS 6 #define SOC_GPIO_INT_TRIG_MASK (3 << SOC_GPIO_INT_TRIG_POS) /** Interrupt is triggered by a level detection event. */ #define SOC_GPIO_INT_TRIG_LEVEL (0 << SOC_GPIO_INT_TRIG_POS) /** Interrupt is triggered by an edge detection event. */ #define SOC_GPIO_INT_TRIG_EDGE (1 << SOC_GPIO_INT_TRIG_POS) /** Interrupt is triggered by any edge detection event. */ #define SOC_GPIO_INT_TRIG_DOUBLE_EDGE (2 << SOC_GPIO_INT_TRIG_POS) /** Interrupt is triggered by a high level / rising edge detection event */ #define SOC_GPIO_INT_ACTIVE_HIGH (1 << 8) /* Bit field: SOC_GPIO_FUNC */ #define SOC_GPIO_FUNC_POS 16 #define SOC_GPIO_FUNC_MASK (7 << SOC_GPIO_FUNC_POS) /** Connect pin to peripheral A. */ #define SOC_GPIO_FUNC_A (0 << SOC_GPIO_FUNC_POS) /** Connect pin to peripheral B. */ #define SOC_GPIO_FUNC_B (1 << SOC_GPIO_FUNC_POS) /** Connect pin to peripheral C. */ #define SOC_GPIO_FUNC_C (2 << SOC_GPIO_FUNC_POS) /** Connect pin to peripheral D. */ #define SOC_GPIO_FUNC_D (3 << SOC_GPIO_FUNC_POS) /** Configure pin as input. */ #define SOC_GPIO_FUNC_IN (4 << SOC_GPIO_FUNC_POS) /** Configure pin as output and set it initial value to 0. */ #define SOC_GPIO_FUNC_OUT_0 (5 << SOC_GPIO_FUNC_POS) /** Configure pin as output and set it initial value to 1. */ #define SOC_GPIO_FUNC_OUT_1 (6 << SOC_GPIO_FUNC_POS) struct soc_gpio_pin { u32_t mask; /** pin(s) bit mask */ Pio *regs; /** pointer to registers of the PIO controller */ u8_t periph_id; /** peripheral ID of the PIO controller */ u32_t flags; /** pin flags/attributes */ }; /** * @brief Configure GPIO pin(s). * * Configure one or several pins belonging to the same GPIO port. * Example scenarios: * - configure pin(s) as input with debounce filter enabled. * - connect pin(s) to a peripheral B and enable pull-up. * - configure pin(s) as open drain output. * All pins are configured in the same way. * * @remark The function will enable the GPIO module's clock only if * any of its pins is configured as an input. This is typically what * a user wants. A pin will function correctly without clock enabled * when configured as an output or connected to a peripheral. * In some cases, e.g. when a pin is configured as an output with * a pull-up and user wants to read pin's input value it is necessary * to enable GPIO module's clock separately. * * @param pin pin's configuration data such as pin mask, pin attributes, etc. */ void soc_gpio_configure(const struct soc_gpio_pin *pin); /** * @brief Configure a list of GPIO pin(s). * * Configure an arbitrary amount of pins in an arbitrary way. Each * configuration entry is a single item in an array passed as an * argument to the function. * * @param pins an array where each item contains pin's configuration data. * @param size size of the pin list. */ void soc_gpio_list_configure(const struct soc_gpio_pin pins[], unsigned int size); /** * @brief Set pin(s) high. * * Set pin(s) defined in the mask parameter to high. The pin(s) have to be * configured as output by the configure function. The flags field which * is part of pin struct is ignored. * * @param pin pointer to a pin instance describing one or more pins. */ static inline void soc_gpio_set(const struct soc_gpio_pin *pin) { pin->regs->PIO_SODR = pin->mask; } /** * @brief Set pin(s) low. * * Set pin(s) defined in the mask field to low. The pin(s) have to be * configured as output by the configure function. The flags field which * is part of pin struct is ignored. * * @param pin pointer to a pin instance describing one or more pins. */ static inline void soc_gpio_clear(const struct soc_gpio_pin *pin) { pin->regs->PIO_CODR = pin->mask; } /** * @brief Get pin(s) value. * * Get value of the pin(s) defined in the mask field. * * @param pin pointer to a pin instance describing one or more pins. * @return pin(s) value. To assess value of a specific pin the pin's bit * field has to be read. */ static inline u32_t soc_gpio_get(const struct soc_gpio_pin *pin) { return pin->regs->PIO_PDSR & pin->mask; } /** * @brief Set the length of the debounce window. * * The debouncing filter automatically rejects a pulse with a duration of less * than 1/2 programmable divided slow clock period tdiv_slck, while a pulse with * a duration of one or more tdiv_slck cycles is accepted. For pulse durations * between 1/2 selected clock cycle and one tdiv_slck clock cycle, the pulse may * or may not be taken into account, depending on the precise timing of its * occurrence. * * tdiv_slck = ((div + 1) x 2) x tslck * where tslck is the slow clock, typically 32.768 kHz. * * Setting the length of the debounce window is only meaningful if the pin is * configured as input and the debounce pin option is enabled. * * @param pin pointer to a pin instance describing one or more pins. * @param div slow clock divider, valid values: from 0 to 2^14 - 1 */ static inline void soc_gpio_debounce_length_set(const struct soc_gpio_pin *pin, u32_t div) { pin->regs->PIO_SCDR = PIO_SCDR_DIV(div); } #endif /* _ATMEL_SAM_SOC_GPIO_H_ */